Iran President Mahmoud Ahmadinejad says new international sanctions over Iran's nuclear program would only strengthen the country by helping make it more self-sufficient. In a speech Saturday, the Iranian president also said U.S. pressure on Iran had backfired and made Washington more isolated in the eyes of the world. President Barack Obama said Thursday that six world powers dealing with Iran's nuclear program will develop a package of serious new punitive measures over its refusal to halt uranium enrichment in the coming weeks. China has not confirmed U.S. reports it has dropped its opposition to possible new U.N. sanctions.